JPH0661490B2 - Liquid jet nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is designed to swirl a liquid by a nozzle forming body and a tip of a flow path forming member that enters a swirl chamber forming hole of the nozzle forming body. A swirl chamber for ejecting from the outlet is formed, a supply path for pumping liquid to the swirl chamber is formed at the tip portion, and a return flow path for returning the liquid from the swirl chamber is formed inside the flow path forming member. The present invention relates to a liquid ejection nozzle that adjusts the ejection amount by changing and adjusting the return flow rate by the return flow path.

[Conventional technology]

The liquid ejection nozzle is configured such that the liquid supplied from the supply passage is swirled in the swirling chamber and is ejected from the ejection port while being in a vortex state, so that the ejected liquid is effectively atomized. is there.

In this type of nozzle, conventionally, as shown in FIGS. 5 and 6, the liquid from the supply passage (9) is discharged from the outlet (9a) of the supply passage (9).
It was supposed to be supplied directly from the swirl chamber (R).

[Problems to be Solved by the Invention]

Conventionally, the ejection amount is adjusted to be reduced, and while the amount of change that decreases from the maximum ejection amount does not increase too much, that is, while the ejection amount does not become too small, the distribution of spray particles at the destination is reduced. The unevenness was likely to occur. As a result, if the combustion is reduced and adjusted by applying it to a petroleum burner, uneven combustion is likely to occur even at an early stage when the degree of reduction in combustion is relatively small.

An object of the present invention is to provide a nozzle that does not deteriorate in ejection performance even when the ejection amount is changed and adjusted to a relatively large range.

[Means for Solving the Problems]

In the liquid jet nozzle according to the present invention, in the one described at the beginning, in order to achieve the object, a reduced pressure flow for lowering the liquid pressure from the supply passage to a supply pressure in the supply passage and supplying the liquid to the swirl chamber. A path is provided at the leading end.

Further, the constitutions according to claims 2, 3 and 4 are advantageous as follows.

[Action]

The liquid from the supply passage enters the depressurized flow passage to reduce the pressure, then is supplied to the swirl chamber, and is ejected at an appropriate ejection pressure at which the distribution of the spray particles becomes uniform at the supply destination.

According to the second or third aspect of the invention, it operates as follows.

That is, when the volume of the swirling chamber is made small so that the amount of air entering the swirling chamber is small, it becomes difficult for air to flow into the return passage. If the volume of the swirling chamber is reduced by the conventional configuration in which the tip portion contacts the inner surface of the nozzle forming body to the tip portion, the liquid ejection pressure from the ejection port becomes high and the distribution at the ejection supply destination becomes non-uniform. It will be easier. On the other hand, according to the configuration of the present invention, even if the volume of the swirling chamber is small and the volume of the air can be reduced, the liquid from the supply passage flows out to the swirling chamber through the gap to cause a slight pressure drop. It is possible to eject at a jet pressure that makes the distribution at the jet supply destination as uniform as possible.

Even if each of the return holes has a small diameter so that air does not easily flow in, the return hole area for enabling the flow of the maximum flow rate that needs to be returned from the swirl chamber is secured by the number of return holes. The fluid can be allowed to flow into the return channel at a desired flow rate. Then, the return fluid from the swirl chamber is divided into a plurality of return holes, dispersed and flow into the return flow passage at a plurality of positions as viewed in the flow direction so that a swirl flow is unlikely to occur in the return flow passage. While returning.

According to the structure of claim 4, even if the ejected liquid adheres to the outer surface of the nozzle forming body, the ejected liquid does not enter the draining recess and enter the ejection port, or adheres such that the ejection port bypasses the lateral side and falls. It is possible to prevent the liquid from dripping and guide the drop.

〔The invention's effect〕

Even if the ejection amount is adjusted to a smaller amount than before, the action of the decompression flow path makes the ejection liquid evenly distributed to the supply destination as much as possible, making it possible to prevent uneven supply. It can be widened, for example, when applied to an oil water heater, the amount of heat generated can be widely adjusted while maintaining a stable combustion state, and the hot water temperature can be adjusted appropriately and safely and energy can be saved. It's ready to use.

According to the second and third aspects, even if the ejection amount is adjusted to be smaller than the conventional amount, the relationship between the ejection port and the swirl chamber, or the shape and arrangement of the top end portion, the outflow port, and the return hole. Due to the action of the configuration, air does not easily flow into the return flow path and swirl flow is less likely to occur, coarsening of spray particles and pulsating ejection are less likely to occur, and the ejected liquid is distributed to the destination as evenly as possible. The unevenness is less likely to occur and the ejection amount can be adjusted widely.

Further, when the draining concave portion is formed, even if the liquid adheres to the outside, it is difficult for the liquid to adhere to the ejection port and the ejection failure does not easily occur.

〔Example〕

 Next, examples will be shown.

As shown in FIG. 4, the nozzle body (2) and the flow path forming member (3) are internally provided on one end side of the nozzle case (1) to form the nozzle main body, and the nozzle case (1) A supply / discharge member (5) having a filter (4) on the end side is screwed to connect the liquid supply pipe (6) to the nozzle case (1) and the liquid return pipe (7) to the supply / discharge member (5). Liquid supply and return discharge of the supplied liquid by connecting with the return amount control valve (V)
The liquid ejection nozzle is configured so that the ejection amount can be changed and adjusted by adjusting the opening degree. This nozzle is used for a kerosene burner of an oil water heater, and is specifically constructed as follows.

That is, as shown in FIG. 1, the tip of the flow path forming member (3)
(3a) is inserted into the conical swirl chamber forming hole (2a) as shown in FIG. 3 of the nozzle forming body (2) and is pressed against the nozzle forming body (2) by the tightening force of the supply / discharge member (5). This forms a swirl chamber (R). Filter from liquid supply pipe (6)
(4), the kerosene that is pressure-fed and supplied through the liquid supply passage (8) formed by the supply / discharge member (5) is formed on the peripheral surface (S) of the tip portion (3a) as shown in FIG. The slit-like supply path (9) is configured to supply pressure to the swirl chamber (R). By arranging the supply passage (9) so that kerosene flows out in a direction along the circumferential direction of the swirl chamber (R) as clearly shown in FIG.
(R) is configured so that the kerosene from the supply passage (9) is swirled in a vortex state and ejected from the ejection port (10) of the nozzle forming body (2), so that the kerosene ejected from the ejection port (10) Is designed to be a mist.

The supply / discharge member (5) is formed inside the flow path forming member (3) with a return flow path (12) that communicates with the discharge flow path (11) formed inside, and at the same time, of the tip portion (3a). Two return holes (13) and (13) are formed in the top end portion (3b) protruding into the swirl chamber (R) so that the swirl chamber (R) and the return flow path (12) communicate with each other, By allowing the kerosene supplied to the swirl chamber (R) to flow into the return flow path (12) by the inflow action that accompanies the swirling, the kerosene of the kerosene supplied to the swirl chamber (R) is The return flow path (12) and the discharge flow path (11) are configured to allow return and discharge. If the opening of the return amount control valve (V) is changed, the return flow path
The flow rate per unit time discharged from (12) and the discharge flow path (11) changes, the internal pressure of the discharge flow path (11) and the return flow path (12) changes, and it returns from the swirling chamber (R). By changing the inflow rate per unit time into the flow path (12), even if the supply pressure to the swirl chamber (R) is maintained at a supply pressure at which the spray particles can be maintained at an appropriate size for combustion, The ejection amount is changed by adjusting the return flow rate by the return flow path (12) by adjusting the return amount control valve (V).

The distance (L) between the tip of the tip portion (3a) and the ejection port (10) is formed to be 1.5 to 2.2 times the diameter (D) of the ejection port (10). Furthermore,
By forming the top end portion (3b) as shown in FIG. 3,
As shown in FIG. 1, the top end portion (3b) and the nozzle forming body
It is configured such that an annular gap (A) exists around the entire apex portion (3b) between the inner surface of (2) and the outlet (9a) of the supply passage (9). Decompression flow path between the and swirl chamber (R)
Formed (A). In other words, the decompression flow path (A) is the supply path (9)
By slightly lowering the kerosene from the supply pressure in the supply path (9) to the swirl chamber (R),
(D) and the gap (L) are configured so that the ejection pressure from the ejection port (10) is set to an appropriate pressure.
(R) The amount of air that enters the
The swirling chamber volume is made as small as possible so that it is hard to get caught in 2), and the swirling flow and jet pressure that will cause the spray particles to be evenly distributed with an appropriate size can be expressed in the swirling chamber (R). is there.

The two return holes (13), (13) are the return flow paths in the top end portion (3b).
The kerosene returned from the swirl chamber (R) is diverted to the two return holes (13) and (13) by being placed at a position eccentric from the center (C) of (12) to the outer circumference side of the return flow path and returned. The flow path (12) is configured so as to be dispersed and flow into the flow path (12) at a plurality of positions as viewed in the flow direction. The return hole area required for returning kerosene from the swirl chamber (R) to the return passage (12) is secured by the two return holes, and
The area of the three return holes (13) is designed to be small so that air entrapment does not easily occur.

A draining recess (14) is formed on the outer surface of the nozzle forming body (2), and the draining recess (14) is formed as shown in FIG.
It is formed in an annular shape surrounding (10). Even if kerosene or water adheres to the nozzle body (2) or nozzle case (1), the drainage recess (1
It is intended to prevent the adhering liquid from blocking the jet port (10) by entering into the column (4) or by bypassing the jet port (10) laterally by the guide by the draining recess (14) and dropping.

[Another embodiment]

 Three or more return holes (13) may be provided for implementation.

INDUSTRIAL APPLICABILITY The present invention can be applied not only to kerosene but also to a nozzle used for a burner that uses a passage or gasoline as fuel. It can also be applied to nozzles used in humidifiers and drug sprayers. Therefore, the liquid to be sprayed is simply referred to as a liquid.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a liquid ejection nozzle according to the present invention. FIG. 1 is a sectional view of a nozzle body, FIG. 2 is a front view of a flow path forming member, and FIG. 3 is a nozzle forming body and a flow path forming member. FIG. 4 is a sectional view of the entire nozzle. FIG. 5 is a front view of a conventional flow path forming member, and FIG. 6 is a sectional view of a conventional nozzle body. (2) …… Nozzle formation body, (2a) …… Swirl chamber formation hole, (3) ……
Flow path forming member, (3a) ... tip part, (3b) ... top end part,
(9) …… Supply path, (9a) …… Outlet, (10) …… Spout, (1
2) ...... Return channel, (13) ...... Return hole, (14) …… Drain recess, (R) …… Swirling chamber, (S) …… Circumferential surface, (A) …… Decompression channel,
(C) …… center, (D) …… diameter, (L) …… spacing.

(72) Inventor Kunihiko Ishizaka 43-1, Uozakihama-cho, Higashinada-ku, Kobe-shi, Hyogo Nihon Yupro Co., Ltd. (72) Inventor Shigefumi Yasunaga 43-1, Uozakihama-cho, Higashinada-ku, Kobe, Hyogo Within Yupro Co., Ltd. (72) Inventor Yasuo Hamada 2-8-1, Motomura, Chigasaki, Kanagawa Totoki Ware Co., Ltd. (72) Inventor Yuzuru Nakamura 2-8-1, Motomura, Chigasaki, Kanagawa In-house (72) Inventor Masato Arimatsu 2-8-1 Motomura, Chigasaki-shi, Kanagawa Totoki Ware Co., Ltd. (72) Inventor Hiroyoshi Asagawa 4-33, Uegahara Yonbancho, Nishinomiya-shi, Hyogo Prefecture ) Inventor Nobuyuki Jusei 3-15-3, Samagagaoka, Mita City, Hyogo Prefecture (72) Inventor Hirokazu Nishida 293-7 Otani, Yamanami-cho, Hikami-gun, Hyogo Prefecture

Claims (4)

[Claims] 1. A nozzle forming body (2) and this nozzle forming body (2)
The swirl chamber (R) that swirls the liquid and ejects it from the ejection port (10) is formed by the tip portion (3a) of the flow path forming member (3) entering the swirl chamber forming hole (2a) of A supply passage (9) for pumping liquid to the chamber (R) is formed in the tip portion (3a), and a return passage (12) for returning the liquid from the swirl chamber (R) is formed in the passage forming member (3). ), A liquid ejection nozzle for adjusting the ejection amount by changing the return flow rate by the return flow passage (12), wherein the liquid from the supply passage (9) is supplied through the supply passage (9). A liquid ejection nozzle having a pressure-reducing flow path (A), which is supplied to the swirl chamber (R) at a pressure lower than the supply pressure thereof, at the tip portion (3a). 2. The gap (L) between the tip of the tip portion (3a) and the jet outlet (10) is formed to be about twice the diameter (D) of the jet outlet (10). The liquid jet nozzle described. 3. The top end portion of the pressure reducing channel (A) between the top end portion (3b) of the tip end portion (3a) and the nozzle forming body (2).
(3b) is a gap over the entire circumference, and a plurality of return holes (13) for connecting the swirl chamber (R) and the return flow path (12) are connected to the return flow path of the top end (3b). The liquid ejection nozzle according to claim 1, wherein the liquid ejection nozzle is formed at a location eccentric from the center (C) of the (12). 4. The liquid ejection nozzle according to claim 1, wherein a draining recess (14) is formed on the outer surface of the nozzle forming body (2) so as to surround the ejection port (10).